慢速英语:出现无法解释疾病 新冠肺炎疫苗试验再次暂停

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illness - n. a condition of being unhealthy

clinical - adj. of or relating to the medical treatment that is given to patients in hospitals, clinics, studies...

alert - adj. able to notice

inflammation - n. a condition in which a part of your body becomes red, swollen and painful